How to improve every game?

I think im improving in rating by making less blunders since i started playing a couple of weeks back..

But i feel most of my games are decided by either blunders or some opening mistakes by enemy especially in kings pawn opening.

Some players i play with say they try something new every game, but i usually just go with Kings pawn opening pretty much every game.

So, what is the mindset i need to have to make maximum use out of each game? Should i play gambits to put pressure on myself to make accurate play?

What should i try to learn from every game and how to improve after every game.

What should i be thinking/trying other than trying to defeat the opponent in the easiest way possible..

I do watch chess videos every now and then but i dont really change my playstyle, basically i dont know "how to play the game" in order to improve, all i do is try to win, which is okay but isnt optimal.

Like how would grandmaster's play when theyre practising as opposed to playing in a tournament

What should be the aim for me in every game so i feel i make noticeable "actual" improvement in every game

Seven months ago you came here with a plan to make GM and said you were willing to study 2 hours a day for the next 7 to 10 years.

Many people made helpful suggestions.

I take it you haven't actually started that plan yet. Or maybe you started but you didn't keep to it very long. Out of the 180+ days since then, how many days did you keep to that 2 hours a day plan?

Improvement comes with spurts and fits, its rarely steady. Your at a platue at the moment. Be consistant it will happen.

I was stupid then thinking i can spend 2 hours a day. It was just a feel of the moment thing where i didnt know what to do in life and i was confused. And needless to say i didnt play after making that post until 2 weeks earlier. I do not want to become GM/IM or anything, you could say i have changed as a person and have a new perspective on life.

But that doesnt have any bearing on my current question which is simply how to make the most out of each game i play.

It is a simple enough question, how to make maximum use of the time spent on each game. I dont want to spend hours playing everyday, i just want to make noticeable improvement after every game.
I just feel like im playing the game wrong, with a wrong mindset 

Like literally every one of my last 5 games were because of enemy blunders  :|

You just keep playing and improve on rating. Eventually you will get to 1800+ where huge decisive blunders aren't that frequent. you will come across very resourceful players